Pressure-controlling valve mechanism for hydraulic presses



No. 613,7I6. Patented N'ov.- 8 I898.

w. w. PRICE. PRESSURE CONTROLLING VALVE MECHANISM FOR HYDRAULIC PBESSES.

(Application filed Apr. 8, 1897.) \N0 Model.)

W NEEEEE: 4.5/7

PZUWW I UNITE STATES PATENT OFFICE.

WILLIAM W. PRICE, OF HOUSTON, TEXAS.

PRESSURE-CONTROLLING VALVE MECHANISM FOR HYDRAULIC PRESSES.

'srscrrrca'rroiv forming part of Letters Pateht No. 613,716, dated November s, 1898.

Application filed April 8, 1897.

To a whom it may concern.-

Be it known that I, WILLIAM VVDPRIOE, of Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Pressure-Oontrollin g Valve Mechanism for Hydraulic Presses, of which the following is a specification.

The present invention relates to an apparatus or mechanism for controlling the admission of fluid-pressures to hydraulic presses; and its prime object is to provide an arrangement of valves which will permit of the successive operation of the two pressures,low and high, by the manipulation of a single valve, in contradistinction to former arrangements requiring a second manipulation to admit the high pressure when the low pressure has done all the work of which it is capable. In some of the former mechanisms the high-pressure valve is opened byhand when the low pressure has completed its work, while in other mechanisms the high-pressure valve is opened automatically as soon as the press-resistance equals the low pressure. By my arrangement the manipulation of a single valve in the first instance will be productive of successive operation of the low and high pressures without the opening of any other valve, and when the high pressure assert-s itself at the time the low pressure has completed its work the low pressure will be cut off automatically and may be directed to another press.

With the above-stated object in view the invention consists in certain novel arrangements and combinations of parts recited in the appended claims.

The drawings which accompany and form part of this specification illustrate an embodiment of the invention.

Figure 1 shows a top plan view of the apparatus with a broken-line representation of the various passages. Figs. 2, 3, and 4 show sections taken on lines 2 2, 3 3, and 4 4, respectively, of Fig. 1, looking in directions indicated by arrows crossing said lines.

The letter a designates the casing of the valve mechanism, which at the left-hand end, as seen in Fig. 1, is bifurcated, forming two arms or nipples bored longitudinally to provide two passages 11 and c and equipped at Serial No. 631,253. (No model.)

I their outer ends with unions b c for coupling with low and high pressure pumps or other suitable fluid-pressure producers. The passages b and c communicate, respectively, with short vertical passages 12 0 which enter, re-

spectively, cylindrical chambers 19 0 having seats 19 c for conical valves 19 0 the latter being checkvalves to permit passage of pressures to the press, but to prevent backflow.

Having thus far indicated the respective courses of the two pressures, I shall leave them for the present and designate a passage cl, which extends longitudinally in the middle of the main casing, and hence out of alinement with both the before-mentioned passages 19 c. This passage d communicates at one end with a passage e, extending at right angles to it and leading to the press, and said passage d opens at the other end into a chamber f, having a seat g for a conical valve g, whose stem g extends out of one end of the casing and is equipped with a handle 9 The said stem has a screw-threaded portion working in a nuth, fixed to the casing, so

that upon turning the handle 9 the valve ing from the check-valve chamber 19 and a vertical passage 79 leading from the diagonal passage into the said chamber f at a point in proximity to the valve-seat g. The highpressure passage 0 is also connected with the chamber f, but at a point more remote from the said valve-seat,the connection being made through a longitudinal passage 0 leading out of the chamber 0 a transverse passage 0 leading from said longitudinal passage, and

a vertical passage 0 leading from said trans- 9o verse passage into the chamber f. The passages c c c are small in cross-sectional area as compared with the low-pressure passages, and there is arranged between the passages 0 and c a throttling device or choker t', which 5 will be specifically described hereinafter.

The operation of the apparatus thus far described is as follows: The pressure producers or accumulators being connected with the couplings b and o and in communication I00 e eiavi with the passages Z) and 0, respectively, in order to put the press in operation it is simply necessary to turn the handle g in a direction to unseat the valve g, whereupon communication is established between the presspassage (Z and both the high andlow pressure accumulators, the communication with the low pressure being by Way of passages 19 b chamber b diagonal passage b vertical passage b", and chamber f, and communication with the high pressure being by way of pas sages c o chamber 0 passages c 0 c and chamber f.

The high pressure is so restricted in its passage to the press that it does not at the outset assert itself, and the low pressure rushes to the press and performs its work of moving the press-plunger through a preliminary traverse before the high pressure can assert itself; but eventually, when the low pressure has performed all it is capable of performing in the press, the high pressure is felt in the press and the operation of pressing is completed. At the same time the low pressure is out oh? by the closing of the check-valve b by the superior pressure between it and the press. It will thus be seen that the manipulation of a single valve is followed by successive operations of the low and high pressures without requiring any other valve to be opened subsequently to admit the higher pressure. In this connection it will be observed that the low-pressure check-valve is so far removed from the path of the high pressure as not to be immediately affected thereby. Otherwise the higher pressure might prevent any opening of this checkvalve.

A relief-valve j is arranged in a chamber 0 j, communicating with the press-passage e and having a suitable valve-seat j above which is an opening j for escape of the pres sure. The stem j of the valve j has a screwthreaded portion which engages a nutj suitably fastened in the casing, and a handle 3' is secured to the projecting end of the stem for the manipulation of the valve.

When for any reason it becomes necessary to cut off the flow from the high and low pressure passages to the chamber f, the two checkvalves b and a may be held to their seats by means of stems 7c and Z, arranged over them and having screw-threaded portions engaging nuts and Z in the casing, so that said stems may be screwed down upon the valves. This expedient will be resorted to when it becomes necessary to remove the throttling device 2' for cleaning or other purposes. This throttling device isof the following-described construction and arrangement. It consists of a comparatively small steel stem, entered through the side of the casing opposite the high-pressure check-valve and having a long tapered end 'i, which is ground to a fit with a correspondingly-formed seat 3* at the end of the passage 0 A small longitudinal groove 2'? is made in one side of the tapered end i, and this constitutes the only means of communication between the passages c and 0 for when the apparatus is in operation the conical end of the stem is in intimate contact with its seat. The stem is screw-threaded through a portion of its length, as shown at 2' and engages a nut 2' fastened in the cas= ing. Should the groove become stopped up, it is only necessary to turn back the stem to an extent sufficient to allow any foreign matter in the groove to be washed out. Of course the groove can be made any size required. If in the operation of the apparatus said groove becomes too large, the stem can be re moved entirely and its tapered end turned down to reduce the size of the groove, after which the stem will be reinserted and screwed down tight to its seat.

Having thus described my invention, what I claim is 1. In a pressure-controlling mechanism for hydraulic presses, the combination of checkvalved passages leading from high and low pressure producers respectively and interrupted only by the check-valves; a passage leading to the press from said check-valved passages, the low-pressure passage communicating with the said press-passage at a point in advance of that Where the high-pressure passage communicates with said press-pas sage, and the check-valve of the low-pressure passage being removed from the path of communication between the high-pressure passage and the press; and a single manuallyoperat'ed valve whose manipulation estab lishes communication for both pressures si multaneously to the press, substantially as described.

2. In a valve mechanism for hydraulic presses, the combination of a single passage leading to the press; a manually-operated valve controlling said passage; a check-valved passage leading from the high-pressure producer to the said press-passage and inter rupted only by the checkwalve; a throttling device in said high-pressure passage; a passage leading from the low=pressure producer into the press-passage at a point in advance of the high-pressure passage; and a check valve in the low-pressure passage located out of the path of communication between the high-pressure passage and the press.

3. In a pressure-controller for a hydraulic press, the combination of high and low pressure passages leading to the press, and a single manipulative valve constituting the only obstruction to the flow of high as well as low pressure to the press, whereby the opening of said valve admits the two pressures simultaneously, substantially as and for the pur pose described.

4. In a pressure-controller for a hydraulic press, the combination of high and low pressure passages leading to the press, means for restricting the flow through the hi gh-pressurc lie eisn'ie a passage, and a single manipulative valve oonname to this specification, in the presence of stituting the only obstruction to the flow of two subscribing witnesses, this 2d day of Janhigh as Well as low pressure to the press, nary, A. D. 1897. whereby the opening of said valve admits the WILLIAM W. PRICE. 5 two pressures simultaneously, substantially Witnesses:

as and for the purpose described. J. M. MOCORD, In testimony whereof I have signed my A. A. MOORE. 

